CN1956435A - Apparatus and method for detecting transmission mode of broadcast signal - Google Patents
Apparatus and method for detecting transmission mode of broadcast signal Download PDFInfo
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- CN1956435A CN1956435A CNA2006101495204A CN200610149520A CN1956435A CN 1956435 A CN1956435 A CN 1956435A CN A2006101495204 A CNA2006101495204 A CN A2006101495204A CN 200610149520 A CN200610149520 A CN 200610149520A CN 1956435 A CN1956435 A CN 1956435A
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- correlation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
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Abstract
The invention is directed to an apparatus for detecting transmission mode of a broadcast signal and a method thereof. In order to detect the transmission mode of a broadcast signal, a correlation value between the broadcast signal and a delayed signal of the broadcast signal is calculated, and the correlation value of special intervals is accumulated. Peak value of the accumulated correlation value is detected by comparing the accumulated correlation value with a threshold value. The transmission mode of the broadcast signal is detected by comparing distances between the peak values with a predetermined frame length. By embodiments of an apparatus for detecting the transmission mode of a broadcast signal and a method thereof, the transmission of the broadcast signal can be effectively detected, and the broadcast signal can be effectively processed by a receiver of the broadcast signal.
Description
The cross reference of related application
The application requires the priority of the korean patent application submitted on August 26th, 2005 10-2005-0079091 number, and it comprises with way of reference at this, as providing in full at this.
Technical field
The present invention relates to a kind of device and a kind of method that detects the transmission mode of broadcast singal that is used to detect the transmission mode of broadcast singal.
Background technology
A kind of new method about the Chinese ground digital television broadcast signal of transmission/reception is proposed.This method is called ground digital multimedia/television broadcasting (DMB-T) technology.
In DMB-T, use the new modulation scheme that is called time-domain synchronization OFDM (TDS-OFDM).As use the system of Cyclic Prefix OFDM modulation scheme, the DMB-T system will be applied in the data that just sending against discrete Fourier transform (DFT) (IDTF).But, different with Cyclic Prefix OFDM modulation scheme, in the protection that sends signal at interval, insert and send pseudo noise (PN).If in protection at interval, use pseudo noise, then can reduce the burden that sends broadcast singal, make the transmitting system of signal can more effectively use transmitting channel.And signal Synchronization device and channel estimator in broadcast signal receiver can move effectively.
Fig. 1 illustrates an example of DMB-T signal transmitter.Referring to Fig. 1, the example of DMB-T signal transmitter has been described.
The example of DMB-T signal transmitter comprises chnnel coding unit 10, modulator 20, IDFT unit 30, PN maker 40, multiplexer 50, filter 60 and transmitting element 70.
10 pairs of chnnel coding unit send the bitstream data that data are carried out chnnel coding and output encoder, make the broadcast reception function detect the mistake that is included in the bitstream data that is sent.
Modulator 20 is according to 4 yuan or 8 yuan or 64 yuan of quadrature amplitude modulation (QAM) scheme etc., the bitstream data of coming modulating-coding.
IDFT unit 30 is converted to time domain data with the modulating data in the frequency domain.Particularly, 3780 frequency domain data components that are included in the frame of the signal that the DMB-T system sends can be converted into the time domain data component.
The PN sequence that PN maker 40 produces as the training signal that sends signal.Multiplexer 50 is multiplexed by the PN sequence of PN maker 40 outputs and the data component of being exported by IDFT unit 30 that is converted.
Filter 60 filter multiplexing data component, with the transmission bandwidth of restriction multiplex data component.Square root raised cosine (SRRC) filter can be used as filter 60, and the roll-off factor (α) of the SRRC filter of limiting bandwidth can be 0.05.
The frequency inverted that transmitting element 70 uses inversion frequency (fc) will send bandwidth restricted signal in the bandwidth is radio frequency (RF).
Protection with PN sequence at interval and have data break by the data of IDFT modulation be included in multiplexer 50 in the frame of multiplexing transmission signal.Protection length at interval can change along with the transmission mode that sends signal, if broadcasting receiver is not according to sending the signal distinguishing transmission mode, then receiver can not carry out demodulation to received signal exactly.
Summary of the invention
Therefore, the present invention is directed to the device of the transmission mode that detects broadcast singal and eliminating owing to the restriction of correlation technique and the method for one or more problems that shortcoming causes in fact.
The purpose of this invention is to provide a kind of device and a kind of method that detects the transmission mode of broadcast singal that detects the transmission mode of broadcast singal, this makes and can effectively detect the transmission mode of received signal and accurately distinguish transmission mode each other.
Attendant advantages of the present invention, purpose and feature part in description is subsequently set forth, and to those skilled in the art, is studying on the basis of content subsequently, and it is clear then partly can to become, maybe can from enforcement of the present invention middle school acquistion to.By the structure that in the specification of being write and claim and accompanying drawing, particularly points out, can be familiar with and obtain purpose of the present invention and other advantage.In order to realize according to these targets of the object of the invention and other advantages, as in this reflection and wide in range description, the invention provides a kind of device that is used to detect the transmission mode of broadcast singal, described device comprises: correlation unit, be used to postpone broadcast singal and calculate described broadcast singal and the signal that postponed between correlation; Accumulate the unit, be used to accumulate the interior correlation of specific interval of described correlation; Peak detection unit is used for the peak value that detects the correlation of being accumulated by the correlation that will be accumulated and threshold; With the mode detection unit, be used for detecting the transmission mode of described broadcast singal by the distance between the described peak value is compared with predetermined frame length.
Described correlation unit can comprise and be used for postponing first buffer of described broadcast singal and being used to calculate the relevant multiplier of the correlation between described broadcast singal and the signal that postponed by interim stored broadcast signal.First buffer can be stored 255 data components of described broadcast singal and the data component of being stored with the order output of the data component stored.
Described accumulation unit can comprise second buffer, and it is used to store the correlation from described correlation unit output; First arithmetic device is used for correlation that will be postponed and the correlation addition of exporting from described correlation unit; Second arithmetic device is used for calculating at the correlation of institute's addition and is stored in difference between the correlation of described second buffer; And delay cell, be used to postpone output to described first arithmetic device from the correlation of described second arithmetic device output and with described correlation.
The number that is stored in the correlation in described second buffer equals the number of the data component in preamble (preamble) interval at described broadcast singal protection interval and the number sum of the data component in described broadcast singal protection postamble (postamble) interval at interval.
The number of the data component in described preamble interval is 50.The number of the data component in described postamble interval is 115.
Described mode detection unit detects the transmission mode of described broadcast singal by the distance between the described peak value is compared with the predetermined frame length according to the protection gap length of transmission mode.
Described broadcast singal may comprise frame synchronization interval with 420 data components and the frame with 3780 data components at interval.
Described broadcast singal may have pseudo noise (PN) sequence in the frame synchronization interval of this broadcast singal, this PN sequence has 255 data components.
In yet another aspect, the invention provides a kind of method that is used to detect the transmission mode of broadcast singal, this method comprises: calculate the correlation between the inhibit signal of broadcast singal and described broadcast singal; Accumulate the correlation in the specific interval of described correlation; The peak value that detects the correlation of being accumulated by the correlation that will be accumulated and threshold; By being compared with predetermined frame length, the distance between the described peak value detects the transmission mode of described broadcast singal.
Described calculation procedure can comprise by interim stored broadcast signal postpone this broadcast singal and calculate described broadcast singal and the broadcast singal that postponed between correlation.
The number of the data component of the broadcast singal of storing in postponing step is 255.The number of the correlation in the specific interval equals the number of the data component in the preamble interval at described broadcast singal protection interval and the number sum of the data component in described broadcast singal protection postamble interval at interval.The step that detects the transmission mode of broadcast singal detects the transmission mode of described broadcast singal by the distance between the described peak value is compared with predetermined frame length.Described predetermined frame length is between the frame length of another transmission mode of the described transmission mode frame length of described broadcast singal and described broadcast singal.
Will be understood that top general description and following detailed description of the present invention all are exemplary and illustrative, and aim to provide desired further explanation of the present invention.
Description of drawings
Described accompanying drawing is used for the diagram embodiments of the invention, and and specification one be used from and explain principle of the present invention, wherein comprise described accompanying drawing providing, and be merged in and form the part of this application further understanding of the present invention.In the accompanying drawings:
Fig. 1 illustrates the example of DMB-T signal transmitter;
Fig. 2 illustrates the example of the frame structure of the signal that sends according to DMB-T transmitter shown in Figure 1;
Fig. 3 illustrates the protection structure at interval in the data that sent by the DMB-T system;
Fig. 4 illustrates the embodiment that is used for the device of detected transmission pattern according to of the present invention;
Fig. 5 is the example that how to detect described transmission mode according to the device of detected transmission pattern of the present invention; With
Fig. 6 is the flow chart of the embodiment of the diagram method that is used for the detected transmission pattern.
Embodiment
To describe the preferred embodiments of the present invention in detail now, wherein the example of these preferred embodiments of diagram in the accompanying drawings.As possible, will in whole accompanying drawing, use same reference numbers to represent same or analogous part.
In order to describe the present invention easily, as the example that uses TDS-OFDM modulating system transmission signal, show the DMB-T system hereinafter.The frame structure of broadcast singal changes along with the transmission mode of the broadcast singal of DMB-T system transmission.
If receive the signal by the TDS-OFDM modulation scheme modulation of using in the DMB-T system in receiver, then receiver must detect the protection interval of this signal.Then receiver can be carried out the additional signals processing.
Fig. 2 illustrates the example according to the form of the signal frame DMB-T transmitter, that will send.Especially, Fig. 2 illustrates the long protection of 1/9 (1/9th) frame structure at interval.Referring to Fig. 2, the protection frame structure at interval of 1/9 (1/9th) length has been described here.
Send signal frame and comprise two parts; A part is called as frame synchronization (frame sync) at interval, and another part is called as frame at interval.Frame is that part of carrying the IDFT data converted at interval, and it is the data block that generally comprises 3780 data components.Frame synchronization comprises the pseudo noise composition at interval, and the exponent number that is used as frame synchronization PN sequence at interval generally can be 8 (m (order)=8).If the exponent number of PN sequence is 8, then 255 kinds of PN sequences can be used as frame synchronization at interval and each PN sequence have 255 PN components.It is a preamble interval and a postamble interval that each PN sequence is expanded, and makes to comprise that this preamble interval and postamble expansion PN sequence at interval are used for sending the protection interval of signal.
The preamble interval and the postamble of PN sequence are the iteration interval of the specific part of PN sequence at interval, and each iteration interval is used for frame synchronization cyclic extensions at interval.115 PN components of the beginning of PN sequence add the end of PN sequence to, and this PN sequence has 255 data components, and last 50 PN components of PN sequence add the front end of PN sequence to.Therefore, the PN sequence of each expansion comprises 420 PN components.
Part (B) with 115 PN components of beginning of PN sequence is called as preamble at interval, and the part (A) with last 50 PN components of PN sequence is called as postamble at interval.Formula P (X)=X
8+ X
6+ X
5+ X+1 can be used as the multinomial that generates the PN sequence, and under the sort of situation, the phase place of the PN sequence that this formula generates changes between 0 to 254.
The transmission mode that sends signal can change along with the length at protection interval.For example, protection length at interval can be 1/9 (1/9th) of frame gap length.Protection length at interval also can be 1/4 (1/4th) 1/6 (sixth) of frame gap length.If protection length at interval is 1/9 (1/9th) of frame gap length, the number that then is included in the data component in the protection at interval is 420, it be included in the data component of frame at interval number (promptly 3780) 1/9.And in such cases, expansion has the PN sequence of 255 data components, with by data component and postamble the data component at interval in of preamble at interval added in the PN sequence, 420 data components is included in the protection at interval.In other words, under the protection transmission mode situation at interval of 1/9 length, 420 data components can be used in the frame synchronization interval.Therefore, the DMB-T system signal frame is included in 420 data component and frame 3780 the data components at interval in of frame synchronization at interval.
On the other hand, if protection length at interval is 1/4 (1/4th) of frame gap length, then further add 525 data components to frame front end at interval as the part of frame 3780 data components at interval.Because the data component in the frame interval is replicated, and the data component that is duplicated is added in the frame interval.Therefore, frame structure is called as " Cyclic Prefix " structure.Replacedly, these 525 data components can be filled to be 0.If protection length at interval is 1/4 (1/4th) of frame gap length, then frame synchronization comprises 945 data components at interval, and this number is 1/4 (1/4th) of frame interval data number of components (i.e. 3780 data components).
Fig. 3 illustrates the protection spacer structure of the signal of DMB-T system transmission.Referring to Fig. 3, the protection structure at interval in the signal that the DMB-T system sends has been described.
Last 50 PN components (A) of PN sequence are added to the front end of 255 data components of PN sequence, and the beginning 115PN component of PN sequence adds the end of 255 data components of PN sequence to.Therefore, the PN sequence after being added has 420 data components, and (A, B) (A B) has identical data with comprise postamble last continuous P N component at interval in protection at interval to comprise preamble first continuous P N component at interval in protection at interval.Therefore, if calculate continuous P N component and the correlation between A and the B continuous P N component at interval in the end at interval at first A and B, and accumulate this correlation, the correlation of this accumulation can reach a peak value so.
On the contrary, if calculate first A and B at interval continuous P N component and except the correlation between last A and B other data component at interval at interval, then this correlation is a less relatively value, and especially, the mean value of the correlation of specific interval can reach 0.
Fig. 4 illustrates an embodiment according to the device of transmission mode of the present invention, as to detect broadcast singal.An embodiment according to the device of transmission mode of the present invention, as to detect broadcast singal comprises correlation unit 100, accumulation unit 200, peak detection unit 300 and mode detection unit 350.
The broadcast singal that correlation unit 100 postpones to be received also calculates the correlation between inhibit signal and broadcast singal.Broadcast singal is stored in and reaches predetermined amount of time in the correlation unit, and exports as inhibit signal.
Correlation can be accumulated in accumulation unit 200 in the specific interval of correlation.Described in the example of Fig. 3, comprise that preamble A and the PN component in the B interval at interval is overlapping in the protection at interval of broadcast singal with the PN component in A that comprises the postamble interval and the B interval.Therefore, if a plurality of correlations of accumulation unit 200 accumulations, then the number of this correlation equals the number (N of the data component in the preamble interval
Pre) and at the number (N of the data component of postamble at interval
Post) sum, the correlation of being accumulated can reach peak value.
First arithmetic device 220 is with the correlation of correlation unit 100 outputs and the correlation addition of delay cell 250 delays.Therefore, first arithmetic device 220 is accumulated continuously from the correlation of relevant multiplier 120 outputs.
Second arithmetic device 230 calculates from the difference between correlation after the addition of first arithmetic device 220 and the correlation that postponed by second buffer 210, for example, from the correlation after the addition of first arithmetic device 220, deduct the correlation that postpones by second buffer 210.Therefore, second arithmetic device 230 can be accumulated correlation in specific interval, and this interval is with the correlation by correlation unit 100 output be shifted (shift).
For example; for the protection transmission mode at interval of protection transmission mode and 1/9 (1/9th) length at interval of distinguishing 1/4 (1/4th) length, the scope of predetermined frame length can be between the length at protection interval of transmission mode of protection length and 1/9 (1/9th) length at interval of transmission mode of 1/4 (1/4th) length.
Fig. 5 is according to the device of the transmission mode of the detection broadcast singal of the present invention example of detected transmission pattern how.In Fig. 5, code element number in trunnion axis (X-axis) the expression broadcast singal, vertical axis (Y-axis) expression is from the accumulation correlation of accumulation unit output.
Solid line represents that the accumulation correlation that produces by according to the protection of 1/4 (1/4th) length transmission mode at interval, dotted line represent the accumulation correlation that is produced by the protection transmission mode at interval according to 1/9 (1/9th) length.Under the protection situation at interval of 1/4 (1/4th) length, produce the peak value of accumulation correlation at interval at every (945+3780) individual data component.On the other hand, under the protection situation at interval of 1/9 (1/9th) length, produce the peak value of accumulation correlation at interval at every (420+3780) individual data component.If the threshold value of detection peak is 2000, then detect the peak value that illustrates that detects among Fig. 5.If the predetermined frame length of detected transmission pattern is at (945+3780) and the value that changes (420+3780), then detect the transmission mode of broadcast singal according to the distance between peak value.
As mentioned above, in the DMB-T system, frame synchronization at interval in the number of data component also change according to transmission mode, therefore, as mentioned above, correct and distinguish broadcast singal effectively according to a plurality of transmission modes by correctly selecting frame length.
Fig. 6 is a flow chart, and it illustrates an embodiment of the method for the transmission mode that detects broadcast singal.Referring to Fig. 6, the described embodiment of the method for the transmission mode that detects broadcast singal has been described.
At first, the correlation (S10) of calculating between the inhibit signal of broadcast singal and described broadcast singal.Correlation (S20) in the accumulation specific interval.By correlation and threshold, detect the peak value (S30) of the correlation of accumulation with accumulation.By the transmission mode (S40) of will the distance between peak value comparing with predetermined frame length and detecting broadcast singal.
The embodiment and the method thereof of the device of the transmission mode by detecting broadcast singal can detect the transmission of broadcast singal and the receiver of broadcast singal effectively and can handle broadcast singal effectively.
For a person skilled in the art, under the situation that does not depart from spirit of the present invention or scope, carry out various modifications and distortion in the present invention but conspicuous.Therefore, the present invention is intended to cover modification of the present invention and the distortion that proposes in the scope of attached claim and their equivalent.
Claims (15)
1, a kind of device that is used to detect the transmission mode of broadcast singal, described device comprises:
Correlation unit, be used to postpone broadcast singal and calculate described broadcast singal and the signal that postponed between correlation;
Accumulate the unit, be used to accumulate the interior correlation of specific interval of described correlation;
Peak detection unit is used for the peak value that detects the correlation of being accumulated by the correlation that will be accumulated and threshold; With
The mode detection unit is used for detecting the transmission mode of described broadcast singal by the distance between the described peak value is compared with predetermined frame length.
2, device as claimed in claim 1, wherein said correlation unit comprises:
First buffer is used for postponing described broadcast singal by the described broadcast singal of interim storage; With
Relevant multiplier, be used to calculate described broadcast singal and the signal that postponed between correlation.
3, device as claimed in claim 2,255 data components of the described broadcast singal of wherein said first buffer stores and export the data component of being stored with the order of the data component stored.
4, device as claimed in claim 1, wherein said accumulation unit comprises:
Second buffer is used to store the correlation from described correlation unit output;
First arithmetic device is used for correlation that will be postponed and the correlation addition of exporting from described correlation unit;
Second arithmetic device, the difference between the correlation that is used for calculating the correlation of institute's addition and being stored in described second buffer; With
Delay cell is used to postpone output to described first arithmetic device from the correlation of described second arithmetic device output and with described correlation.
5, device as claimed in claim 4, the number that wherein is stored in the correlation in described second buffer equal the data component number of described broadcast singal protection preamble at interval at interval with count sum at the data component of described broadcast singal protection postamble at interval at interval.
6, device as claimed in claim 5, the data component number in the wherein said preamble interval is 50.
7, device as claimed in claim 5, the data component number in the wherein said postamble interval is 115.
8, device as claimed in claim 1, wherein said mode detection unit detects the transmission mode of described broadcast singal by the distance between the described peak value is compared with the predetermined frame length according to the protection gap length of described transmission mode.
9, device as claimed in claim 1, wherein said broadcast singal comprise frame synchronization interval with 420 data components and the frame with 3780 data components at interval.
10, device as claimed in claim 1, wherein said broadcast singal has pseudo noise (PN) sequence in the frame synchronization interval of described broadcast singal, and described PN sequence has 255 data components.
11, a kind of method that detects the transmission mode of broadcast singal, described method comprises:
Correlation between the inhibit signal of calculating broadcast singal and described broadcast singal;
The correlation of accumulation specific interval;
The peak value that detects the correlation of being accumulated by the correlation that will be accumulated and threshold; With
By being compared with predetermined frame length, the distance between the described peak value detects the transmission mode of described broadcast singal.
12, method as claimed in claim 11, wherein said calculation procedure comprises:
Postpone described broadcast singal by the described broadcast singal of interim storage; With
Correlation between the signal that calculates described broadcast singal and postponed.
13, method as claimed in claim 12, wherein the number of the data component of the described broadcast singal of storing in described delay step is 255.
14, method as claimed in claim 11, wherein the number of the correlation in described specific interval equals the number of the data component in the preamble interval at described broadcast singal protection interval and the number sum of the data component in described broadcast singal protection postamble interval at interval.
15, method as claimed in claim 11, wherein said predetermined frame length is between the frame length of another transmission mode of the frame length of the described transmission mode of described broadcast singal and described broadcast singal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR79091/05 | 2005-08-26 | ||
| KR1020050079091A KR100797470B1 (en) | 2005-08-26 | 2005-08-26 | Apparatus for detecting a guard interval in receiver of orthogonal frequency division multiplexed signals |
| KR79091/2005 | 2005-08-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1956435A true CN1956435A (en) | 2007-05-02 |
| CN1956435B CN1956435B (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101495204A Expired - Fee Related CN1956435B (en) | 2005-08-26 | 2006-08-28 | Apparatus and method for detecting transmission mode of broadcast signal |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100797470B1 (en) |
| CN (1) | CN1956435B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101874381A (en) * | 2007-09-28 | 2010-10-27 | 汤姆逊许可证公司 | Time-frequency synchronization and frame number detection for DMB-T systems |
| CN101640790B (en) * | 2008-07-30 | 2011-08-10 | 奇景光电股份有限公司 | Method and system for identifying frame header |
| CN102457451A (en) * | 2010-10-22 | 2012-05-16 | 索尼公司 | Reception apparatus, reception method, and program |
| TWI384881B (en) * | 2008-07-01 | 2013-02-01 | Himax Tech Ltd | Frame header recognition method and system |
| CN102457451B (en) * | 2010-10-22 | 2016-12-14 | 索尼公司 | Receive device and method of reseptance |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102337651B1 (en) | 2014-02-13 | 2021-12-10 | 삼성전자주식회사 | Transmitting apparatus and receiving apparatus and controlling method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100191326B1 (en) * | 1996-09-25 | 1999-06-15 | 윤종용 | Apparatus for detecting frame sync. using guard interval |
| JP2000059330A (en) * | 1998-08-04 | 2000-02-25 | Sony Corp | Receiver for digital broadcast |
| JP3735493B2 (en) * | 1999-08-26 | 2006-01-18 | 日本電気株式会社 | OFDM signal symbol length detection apparatus |
| CN1142644C (en) * | 2001-08-17 | 2004-03-17 | 清华大学 | Filling method of protecting gap in orthogonal frequency division multiplexing modulation system |
| KR100464009B1 (en) * | 2002-10-08 | 2005-01-03 | 엘지전자 주식회사 | Start-point detection method for symbol of ofdm receiver |
| JP2005102121A (en) * | 2003-09-05 | 2005-04-14 | Seiko Epson Corp | Receiving apparatus |
-
2005
- 2005-08-26 KR KR1020050079091A patent/KR100797470B1/en active IP Right Grant
-
2006
- 2006-08-28 CN CN2006101495204A patent/CN1956435B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101874381A (en) * | 2007-09-28 | 2010-10-27 | 汤姆逊许可证公司 | Time-frequency synchronization and frame number detection for DMB-T systems |
| CN101874381B (en) * | 2007-09-28 | 2014-03-12 | 汤姆逊许可证公司 | Time-frequency synchronization and frame number detection for DMB-T systems |
| TWI384881B (en) * | 2008-07-01 | 2013-02-01 | Himax Tech Ltd | Frame header recognition method and system |
| CN101640790B (en) * | 2008-07-30 | 2011-08-10 | 奇景光电股份有限公司 | Method and system for identifying frame header |
| CN102457451A (en) * | 2010-10-22 | 2012-05-16 | 索尼公司 | Reception apparatus, reception method, and program |
| CN102457451B (en) * | 2010-10-22 | 2016-12-14 | 索尼公司 | Receive device and method of reseptance |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1956435B (en) | 2011-12-28 |
| KR20070024298A (en) | 2007-03-02 |
| KR100797470B1 (en) | 2008-01-24 |
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